install-build-deps: Fix for Debian Sid

R=dpranke
BUG=None

Change-Id: I7ca639867a7a31738d8fe1fc9d0db365a92cba88
Reviewed-on: https://chromium-review.googlesource.com/1081555
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567076}

build/install-build-deps.sh

@@ -394,7 +394,7 @@ if package_exists libpng16-16; then
 else
   lib_list="${lib_list} libpng12-0"
 fi
-if package_exists libnspr4-dbg; then
+if package_exists libnspr4; then
   lib_list="${lib_list} libnspr4 libnss3"
 else
   lib_list="${lib_list} libnspr4-0d libnss3-1d"